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2 8a+b-a+7b-2a-3b
8a-a-2a+b+7b-3b
= 5a + 5b
= 2a
2. 8a +b -a +7b -2a -3b
= 8a -a -2a +b +7b -3b
= 5a +5a
Itu jawabannya.